Instantly dying from dead enemies i walk by when nothing is there. And other frustrating mechanics

I was running a map in the mountain biome and died from something that didn't appear on the screen. Nothing was there when I walked up to a dead enemy. I died suddenly and my xp got erased. It's frustrating having that happen when every enemy even the normal ones have one hit mechanics sometimes. Losing more xp as your bar gets lower is already a drag and ruins the pacing of the game. Yaota is another boss that needs to get reworked. When she does that forward jump attack you can't roll out the way. For some reason you get locked in place. I spawned back in twice and no joke died from her doing that attack immediately. And like i said the xp loss mechanic really puts a burden on leveling. There needs to be less one hit mechanics and more enjoyable fights in the game.